Riprap Installation

What This Service Involves

We place engineered riprap and rock armor to protect streambanks, culvert outfalls, ditch inverts, and slopes from the erosive force of concentrated stormwater flows. In Western Washington's high-energy wet-season streams and outfalls, unarmored surfaces scour rapidly and threaten adjacent infrastructure. Our crews prepare a proper filter layer or fabric, size and place rock to specification, and key the armor into stable ground to prevent undermining. Where work is near water, we follow the region's in-water timing and permit conditions and document the completed protection.

Benefits

Protects banks and outfalls from scour and undermining; dissipates energy at concentrated-flow discharge points; uses filter layers to prevent piping beneath the armor; keys rock into stable ground for lasting protection; complies with in-water timing and permit conditions

Our Process

1) Assess the erosion or scour problem and design armor sizing; 2) Secure permits and in-water work protections; 3) Prepare the subgrade and filter layer or fabric; 4) Place and key in properly sized riprap, then document the installation

What Affects the Cost

Volume and gradation of rock required; site access for material delivery and placement; filter layer and geotextile needs; permitting and in-water timing constraints; slope preparation and keying extent

Best Time of Year

Riprap near watercourses is installed during the summer fish window and dry season so placement is stable before high wet-season flows arrive.